Could you tell me which informations I must put for DNS (on Amazon Route53 or my registrar), must I add MX records ? or only * A myserverIP ? and If i need to manage DNS with ISP Config (I don't want a DNS server) ?

ou ust add a mx record which has to point to the hostnae of your server (or to another domain / subdomain which has a a-record that points to your server). You dnt have to use the dns on ispconfig for that, using the dns server of your registry is fine.

Hello, I deleted the mail.log file and now I don't have a new mail.log file :-(
How to initialise for another mail.log file ?

The domain is "morlaer.com", it use Amazon Route 53 DNS and DNS informations seems to be OK

I added the domain, and create a mailbox [email protected]
I uncomment the lines :
submission inet n - - - - smtpd
smtps inet n - - - - smtpd
I sent a message from/to this email address with Roundcube
I sent a message from this email address to another gmail address with Roundcube
But I never received email :-(